Investigations of Sm6(Mn1-xFex)23 system

Abstract The new Sm 6 (Mn 1- x Fe x ) 23 (0⩽ x ⩽1.0) system hasbeen synthesized and investigated in a wide temperature range by the X-ray, magnetometric and Mossbauer effect methods. The X-ray studies show that the system forms solid solutions which are isostructural with the Th 6 Mn 23 type crystal structure throughout the entire compositional range. Both Fe-rich and Mn-rich regions of the system are magnetically ordered and are separated from each other by the non-magnetically ordered 0.22⩽ x ⩽0.33 region. The substitution of Fe atoms for Mn atoms in the Mn-rivh region and similarly of Mn atoms for Fe atoms in the Fe-rich region decreases both the Curie temperature and the value of the magnetic moment per molecule. The temperature dependence of the reciprocal susceptibility obeys the Neel law. The Mossbauer absorption spectra reflect wide distributions of the 57 Fe hyperfine interaction parameters, and disappearance of long range magnetic coupling of Fe atoms in the magnetically ordered x =0 to 0.22 composition range.